Had yeast infection, got treated with pills since then my vagina & discharge smell sour/like the medication - since june - pap tests came back normal ?

Talk to your doctor.: What you're describing sounds like BV (bacterial vaginosis), which is an overgrowth of gardnerella vaginalis, a normal but particularly smelly bacteria that's found in the vagina. This sometimes happens after yeast treatment. A vaginal sample is done to make sure it's not something else (like an std...) and then the overgrowth can be easily treated with antibiotics that your doctor prescribes.